CN102156881B - Method for detecting salvage target based on multi-scale image phase information - Google Patents
Method for detecting salvage target based on multi-scale image phase information Download PDFInfo
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- CN102156881B CN102156881B CN2011100929404A CN201110092940A CN102156881B CN 102156881 B CN102156881 B CN 102156881B CN 2011100929404 A CN2011100929404 A CN 2011100929404A CN 201110092940 A CN201110092940 A CN 201110092940A CN 102156881 B CN102156881 B CN 102156881B
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Abstract
The invention discloses a method for detecting a salvage target based on multi-scale image phase information. The method mainly comprises the following steps of: firstly, extracting brightness characteristic images of salvage scene images, and carrying out down-sampling to obtain three brightness maps with three different scales; secondly, carrying out Fourier transformation on each image to calculate a phase spectrum of each image, and obtaining a significant map of each scale image on the basis of the phase spectrum; and finally, combining three significant maps to obtain a total significant map, and extracting a significant target by a given threshold value. The method provided by the invention is simple and applied to a plurality of image scales; and by the method, targets with different sizes can be detected simultaneously, and basis is laid for target tracing and identification in subsequent salvage.
Description
Technical field
The present invention relates to field of machine vision, specially refer to a kind of perils of the sea and search and rescue object detection method based on the multi-scale image phase information.
Background technology
Along with developing rapidly of China's shipping cause, maritime traffic safety is increasingly important.The target of maritime search and rescue work is " round-the-clock running, comprehensive covering, rapid reaction ".It is the integrated application machine vision technique that NI Vision Builder for Automated Inspection is searched and rescued in the perils of the sea, and auxiliary rescue worker searches vessel in distress, survival craft, life-float and persons falling in water etc., thereby overcomes defectives such as people's kopiopia and the visual field be limited, has great importance.Mostly traditional object detection method is to extract moving target from background modeling, the frame-to-frame differences method of grading; Because sea scene background and target all are in the continuous motion; Therefore utilize these method poor effect, the algorithm of methods such as other optical flow method is complicated, is not suitable for real-time application.
In sum, to the defective of prior art, need a kind of perils of the sea to search and rescue object detection method especially, with the problem of mentioning more than solving based on the multi-scale image phase information.
Summary of the invention
The object of the present invention is to provide a kind of perils of the sea to search and rescue object detection method based on the multi-scale image phase information; On the visual attention model basis of image phase spectrum; The remarkable figure of a plurality of yardsticks of synthetic image searches and rescues the target detection problem in the visual scene to realize the perils of the sea.
The technical matters that the present invention solved can adopt following technical scheme to realize:
Object detection method is searched and rescued in a kind of perils of the sea based on the multi-scale image phase information, it is characterized in that said method comprises the steps:
1) extracts the brightness image that scene is searched and rescued in the perils of the sea of importing;
2) said brightness image is carried out down-sampling, obtain the luminance graph of 3 different scales;
3) luminance graph of each yardstick is done Fourier transform, calculate its phase spectrum;
4) obtain the remarkable figure of each scalogram picture according to phase spectrum;
5) the remarkable figure of different scale is merged obtain total significantly figure;
6) extract the perils of the sea according to preset threshold and search and rescue the well-marked target in the scene.
In one embodiment of the invention, the yardstick of the luminance graph of said 3 different scales is respectively 1/2,1/4,1/8 of former figure.
In one embodiment of the invention, said method further comprises carries out Threshold Segmentation to total significantly figure, obtains bianry image, thereby obtains well-marked target.
The present invention also can be applicable in maritime affairs monitoring, maritime affairs patrol, based on fields such as the ship collision prevention of video, anti-pirate monitoring, loud and clear prestiges on duty, simultaneously with infrared, remote sensing, radar imagery is technological combines, can be maritime traffic safety etc. comprehensive visual information be provided.
Description of drawings
Fig. 1 is a process flow diagram of searching and rescuing object detection method based on the perils of the sea of multi-scale image phase information of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with embodiment, further set forth the present invention.
The present invention is based on the perils of the sea of multiple dimensioned phase information and searches and rescues object detection method, is primarily aimed at the application that search and rescue the perils of the sea.The present invention is when implementing, and the problem that mainly faces is, and the firstth, select the basis of which characteristic of image, and select the color space of which kind of image to do further processing as subsequent treatment; The secondth, which kind of frequency domain character of selecting image is as the foundation of significantly scheming to generate; The 3rd is how to make detection method detect the perils of the sea simultaneously to search and rescue the different size target in the scene; The 4th is to simplify existing visual attention model, reduces computational complexity.
To first problem, the present invention has selected the perils of the sea to search and rescue the RGB color space of visual scene image, only uses the basis of brightness as subsequent treatment.Because each Color Channel and luminance channel have big correlativity, for simplified model, have only extracted brightness.In test, find to utilize color and brightness, be more or less the same with the result who only uses brightness, thereby the present invention selects only to use the brightness model.
If input picture is: I (x, y), its redness, green and blue component are respectively: r, g, b, then its brightness is: I
I=(r+g+b)/3.
To second problem; The present invention utilizes the phase spectrum of image as the foundation of significantly scheming to generate; This is because the phase spectrum of image has comprised the most information of image, through the reservation phase spectrum, and the amplitude spectrum of all frequency components is made as 1; Can give prominence to the well-marked target in the image, the method for the relative spectral residuum of phase spectrum method is simpler.
Luminance graph I
ITwo-dimensional Fourier transform be:
Wherein F representes Fourier transform, A (u v) is an amplitude spectrum,
It is phase spectrum.Remarkable figure based on phase spectrum is:
wherein IF representes inverse Fourier transform; G (x, y) expression spatial domain Gaussian filter.
To the 3rd problem, the present invention successively with 1/2 down-sampling, extracts each characteristic pattern at 1/2,1/4,1/8 image on totally 3 yardsticks to luminance graph, obtains all required input pictures of the inventive method.Find that through experiment the remarkable figure of single yardstick can't detect the target of each size simultaneously.Therefore the present invention combines 3 yardsticks and significantly schemes; That is:
selects 1/2 of image archeus; 1/4 and 1/8 the remarkable figure of totally 3 yardsticks on former Fig. 1/4 yardsticks, merge, obtain total significantly figure.
To the 4th problem, the present invention has only utilized monochrome information, simultaneously from the frequency domain characteristic of image; Extract well-marked target, as long as its process is done Fourier transform, classical visual attention method; The present invention simplifies greatly, and it is more accurate than existent method to detect effect simultaneously.
Object detection method is searched and rescued in the perils of the sea based on multiple dimensioned phase information of the present invention, realizes through following steps, and is as shown in Figure 1:
1) extracts the brightness image that scene is searched and rescued in the perils of the sea of importing;
2) said brightness image is carried out down-sampling, obtain the luminance graph of 3 different scales;
3) luminance graph of each yardstick is done Fourier transform, calculate its phase spectrum;
4) obtain the remarkable figure of each scalogram picture according to phase spectrum;
5) the remarkable figure of different scale is merged obtain total significantly figure;
6) total significantly figure is carried out Threshold Segmentation, obtain bianry image, thereby obtain well-marked target.
Existing visual attention model has been simplified in use of the present invention, utilizes the image phase spectrum information to detect well-marked target.For taking into account the target of different size in the search and rescue of the perils of the sea, utilize the remarkable figure merging of a plurality of yardsticks to obtain total significantly figure simultaneously, carry out the target detection in the perils of the sea search and rescue visual scene with this.Method of the present invention realizes simple, and it is more accurate based on the target detection zone of spectral residuum method to detect effect.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the instructions just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (3)
1. object detection method is searched and rescued in the perils of the sea based on the multi-scale image phase information, it is characterized in that said method comprises the steps:
1) extracts the brightness image that scene is searched and rescued in the perils of the sea of importing;
2) said brightness image is carried out down-sampling, obtain the luminance graph of 3 different scales;
3) luminance graph of each yardstick is done Fourier transform, calculate its phase spectrum;
4) according to the remarkable figure of each yardstick luminance graph of phase spectrum acquisition, its step is following:
Wherein IF representes inverse Fourier transform, g (x, y) expression spatial domain Gaussian filter;
5) the remarkable figure of different scale is merged obtain total significantly figure;
6) extract the perils of the sea according to preset threshold and search and rescue the well-marked target in the scene.
2. object detection method is searched and rescued in the perils of the sea based on the multi-scale image phase information as claimed in claim 1, it is characterized in that the yardstick of the luminance graph of said 3 different scales is respectively 1/2,1/4,1/8 of brightness image.
3. object detection method is searched and rescued in the perils of the sea based on the multi-scale image phase information as claimed in claim 1, it is characterized in that, said method further comprises carries out Threshold Segmentation to total significantly figure, obtains bianry image, thereby obtains well-marked target.
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| CN102800086B (en) * | 2012-06-21 | 2015-02-04 | 上海海事大学 | Offshore scene significance detection method |
| CN103034865A (en) * | 2012-12-13 | 2013-04-10 | 南京航空航天大学 | Extraction method of visual salient regions based on multiscale relative entropy |
| CN103293168B (en) * | 2013-05-28 | 2015-01-28 | 陕西科技大学 | Fruit surface defect detection method based on visual saliency |
| CN106991682B (en) * | 2016-01-21 | 2019-12-20 | 深圳力维智联技术有限公司 | Automatic port cargo ship extraction method and device |
| CN107423740A (en) * | 2017-05-12 | 2017-12-01 | 西安万像电子科技有限公司 | The acquisition methods and device of salient region of image |
| CN109102495A (en) * | 2018-07-05 | 2018-12-28 | 广州杰赛科技股份有限公司 | Target image determines method and system, computer equipment, computer storage medium |
| CN109188421B (en) * | 2018-07-25 | 2023-07-04 | 江苏科技大学 | Maritime search and rescue system and method for unmanned search and rescue boat |
| CN113592004A (en) * | 2019-02-25 | 2021-11-02 | 深圳市商汤科技有限公司 | Distribution method and device, electronic equipment and storage medium |
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| CN102005057B (en) * | 2010-11-17 | 2012-07-25 | 中国科学院声学研究所 | Method for detecting region of interest of color image |
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